scholarly journals Wearable Supercapacitors, Performance, and Future Trends

2021 ◽  
Author(s):  
Litty V. Thekkekara ◽  
Imtiaz Ahmed Khan
Keyword(s):  
Energy Storage ◽  
Energy Harvesting ◽  
Electrostatic Interaction ◽  
Health Monitoring ◽  
Interaction Mechanism ◽  
Material Design ◽  
Future Trends ◽  
Wearable Technologies ◽  
New Energy ◽  
And Storage

The progress in portable technologies demands compactable energy harvesting and storage. In recent years, carbon-based lightweight and wearable supercapacitors are the new energy storage trends in the market. Moreover, the non-volatile nature, long durability, eco-friendliness, and electrostatic interaction mechanism of supercapacitors make it a better choice than traditional batteries. This chapter will focus on the progress of the wearable supercapacitor developments, the preferred material, design choices for energy storage, and their performance. We will be discussing the integrability of these supercapacitors with the next generation wearable technologies like sensors for health monitoring, biosensing and e-textiles. Besides, we will investigate the limitations and challenges involves in realizing those supercapacitor integrated technologies.

Thermo-mechanical energy harvesting and storage analysis in 0.6BZT-0.4BCT ceramics

2021 ◽  
Author(s):  
Satyanarayan Patel ◽  
Manish Kumar ◽  
Yashwant Kashyap
Keyword(s):  
Energy Storage ◽  
Energy Harvesting ◽  
Thermal Energy ◽  
Mechanical Energy ◽  
Energy Storage Density ◽  
Storage Density ◽  
Thermal Energy Harvesting ◽  
Polarization Electric Field ◽  
And Storage ◽  
Olsen Cycle

Present work shows waste energy (thermal/mechanical) harvesting and storage capacity in bulk lead-free ferroelectric 0.6Ba(Zr0.2Ti0.8)O3-0.4(Ba0.7Ca0.3)TiO3 (0.6BZT-0.4BCT) ceramics. The thermal energy harvesting is obtained by employing the Olsen cycle under different stress biasing, whereas mechanical energy harvesting calculated using the thermo-mechanical cycle at various temperature biasing. To estimate the energy harvesting polarization-electric field loops were measured as a function of stress and temperatures. The maximum thermal energy harvesting is obtained equal to 158 kJ/m3 when the Olsen cycle operated as 25-81 °C (at contact stress of 5 MPa) and 0.25-2 kV/mm. On the other hand, maximum mechanical energy harvesting is calculated as 158 kJ/m3 when the cycle operated as 5-160 MPa (at a constant temperature of 25 °C) and 0.25-2 kV/mm. It is found that the stress and temperature biasing are not beneficial for thermal and mechanical energy harvesting. Further, a hybrid cycle, where both stress and temperature are varied, is also studied to obtain enhanced energy harvesting. The improved energy conversion potential is found as 221 kJ/m3 when the cycle operated as 25-81 °C, 5-160 MPa and 0.25-2 kV/mm. The energy storage density varies from 43 to 66 kJ/m3 (increase in temperature: 25-81 °C) and 43 to 80 kJ/m3 (increase in stress: 5 to 160 MPa). Also, the pre-stress can be easily implemented on the materials, which improve energy storage density almost 100% by domain pining and ferroelastic switching. The results show that stress confinement can be an effective way to enhance energy storage.

scholarly journals Nanofibers-Based Piezoelectric Energy Harvester for Self-Powered Wearable Technologies

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2697
Author(s):  
Fatemeh Mokhtari ◽  
Mahnaz Shamshirsaz ◽  
Masoud Latifi ◽  
Javad Foroughi
Keyword(s):  
Energy Harvesting ◽  
Output Voltage ◽  
Electrospun Nanofibers ◽  
Cost Effective ◽  
Energy Materials ◽  
Current Output ◽  
Wearable Technologies ◽  
Piezoelectric Energy ◽  
New Energy ◽  
Self Powered

The demands for wearable technologies continue to grow and novel approaches for powering these devices are being enabled by the advent of new energy materials and novel manufacturing strategies. In addition, decreasing the energy consumption of portable electronic devices has created a huge demand for the development of cost-effective and environment friendly alternate energy sources. Energy harvesting materials including piezoelectric polymer with its special properties make this demand possible. Herein, we develop a flexible and lightweight nanogenerator package based on polyvinyledene fluoride (PVDF)/LiCl electrospun nanofibers. The piezoelectric performance of the developed nanogenator is investigated to evaluate effect of the thickness of the as-spun mat on the output voltage using a vibration and impact test. It is found that the output voltage increases from 1.3 V to 5 V by adding LiCl as additive into the spinning solution compared with pure PVDF. The prepared PVDF/LiCl nanogenerator is able to generate voltage and current output of 3 V and 0.5 μA with a power density output of 0.3 μW cm−2 at the frequency of 200 Hz. It is found also that the developed nanogenerator can be utilized as a sensor to measure temperature changes from 30 °C to 90 °C under static pressure. The developed electrospun temperature sensor showed sensitivity of 0.16%/°C under 100 Pa pressure and 0.06%/°C under 220 Pa pressure. The obtained results suggested the developed energy harvesting textiles have promising applications for various wearable self-powered electrical devices and systems.

Nanomaterials for Energy Harvesting and Storage

2021 ◽  
pp. 188-203
Author(s):  
Arunima Nayak ◽  
Vipin Kumar Saini ◽  
Brij Bhushan
Keyword(s):  
Energy Storage ◽  
Energy Harvesting ◽  
Lithium Ion Batteries ◽  
Electricity Generation ◽  
Lithium Ion ◽  
Storage Devices ◽  
Photocatalytic Hydrogen Generation ◽  
Recent Developments ◽  
Composition Structure ◽  
And Storage

The possibility of both energy and environmental crisis that may arise due to use of fossil fuels has resulted in intense research activities in the past decade on the development of technologies for harvesting and storage of energy from renewable sources. In order to meet the energy requirements for an ever-increasing population, there is a need for high performance electrochemical energy harvesting as well as storage devices. Nanomaterials and nanocomposites with diverse composition, structure, and morphologies have been applied in various energy related applications ranging from photocatalytic hydrogen generation, solar electricity generation, electric energy storage by lithium ion batteries and supercapacitors, hydrogen storage systems, etc. The aim of this chapter is to provide an overview of the recent developments in the technological advancements brought about by the use of nanotechnology in energy harvesting and storage appliances with specific focus on dye sensitized solar cells for electricity generation, lithium ion batteries, and supercapacitors for energy storage.

Nano-ZnO decorated ZnSnO3 as efficient fillers in PVDF matrixes: toward simultaneous enhancement of energy storage density and efficiency and improved energy harvesting activity

Nanoscale ◽  
2020 ◽  
Vol 12 (40) ◽  
pp. 20908-20921
Author(s):  
Abhishek Sasmal ◽  
Samar Kumar Medda ◽  
P. Sujatha Devi ◽  
Shrabanee Sen
Keyword(s):  
Energy Storage ◽  
Dielectric Loss ◽  
Energy Harvesting ◽  
Dielectric Permittivity ◽  
Electrical Energy ◽  
Energy Storage Density ◽  
Storage Efficiency ◽  
Storage Density ◽  
Electrical Energy Storage ◽  
And Storage

Along with enhanced dielectric permittivity and suppressed dielectric loss, PVDF-ZnO@ZnSnO3 films showed simultaneous enhancement in electrical energy storage density and storage efficiency compared to PVDF-ZnSnO3 composites.

A highly efficient self-power pack system integrating supercapacitors and photovoltaics with an area-saving monolithic architecture

2017 ◽  
Vol 5 (5) ◽  
pp. 1906-1912 ◽  
Author(s):  
Junghwan Kim ◽  
Sun Min Lee ◽  
Yun-Hwa Hwang ◽  
Seongyu Lee ◽  
Byoungwook Park ◽  
...  
Keyword(s):  
Solar Cell ◽  
Energy Storage ◽  
Energy Harvesting ◽  
Energy Systems ◽  
Storage Capacitor ◽  
Multiple Functions ◽  
Highly Efficient ◽  
Energy Storage Capacitor ◽  
And Storage

Self-charging power packs (SPPs), integrating both a solar cell and energy storage capacitor (EC) into a single device, are very promising energy systems due to their multiple functions of energy harvesting and storage.

Future trends in health monitoring of materials

2001 ◽  
Vol 89 ◽  
pp. 31-33
Author(s):  
L. Flandin ◽  
Y. Bréchet ◽  
J.Y. Cavaillé
Keyword(s):  
Health Monitoring ◽  
Future Trends

Nonlinear modeling and simulation of flywheel energy storage rotor system with looseness and rub-impact coupling hitch

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Zhu Youfeng ◽  
Liu Xinhua ◽  
Wang Qiang ◽  
Wang Zibo ◽  
Zang Hongyu
Keyword(s):  
Energy Storage ◽  
Differential Equations ◽  
Nonlinear Modeling ◽  
Storage System ◽  
Energy Storage System ◽  
Rotor System ◽  
Flywheel Energy Storage ◽  
Flywheel Energy Storage System ◽  
New Energy ◽  
Single Disk

Abstract Flywheel energy storage system as a new energy source is widely studied. This paper establishes a dynamic model of a single disk looseness and rub-impact coupling hitch flywheel energy storage rotor system firstly. Then dynamic differential equations of the system under the condition of nonlinear oil film force of the sliding bearing are given. Runge–Kutta method is used to solve the simplified dimensionless differential equations. The effect of variable parameters such as disk eccentricity, stator stiffness and bearing support mass on the system are analyzed. With the increase of eccentricity, the range of period-three motion is significantly reduced and the range of chaotic motion begins to appear in the bifurcation diagram. Meanwhile, stiffness of the stator and mass of the bearing support have a significant influence on the flywheel energy storage rotor system.

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